Testing instrument and regulator



March 21, 1933. A 1,902,542

TESTING INSTRUMENT AND REGULATOR Filed Sept. 16, 1929 Patented Mar. 21, 1933 UETEl) EYTATES PATENT QFFICE PENRQSE CHAPMAN, OF ST. LOUIS, MISSOURI TESTING- INSTRGIVEENT AND REGULATOR Application filed September 16, 1929. Serial No. 392,830.

he object of my inventionis to render the yoke, 16, which is preferably rigidly suparmature testing instrument revealed in my ported. Patent No. 1,"? issued Ma 20, 1930, To provide for variation of the air gap, adjustable; to produce a regul a device i prefer to form the face of the poles, 15, tathat shall e useful in connectio with said pered or conical, and to provide an armature,

instrument and elsewhere and which shall 18,,With a reverse tapered or conical face so be continuously adjustable, rugged, durable, that as Said armature is advanced into posifree from internal contacts, and not likely U 1 OPPOS e Said polcs,15,the air gap Willbe to get out of rder and which hall be 1133- shortened ill the 5211118 time its EH83, is altered. to sonaoly quiet in operation. I prefer to control the position of the arma- The single figure of the accompanying ture, 18, and/or the SllOIl] circuiting element, drawing is. a. srgcbignal perspective igvg 3f 2 Screw thread such as and nut, 23, these improvements in detail combined with lid t0 ount Said armature in a carrier such a simplified a d abbreviated diagram of the HS 19 d to support said carrier on any suit 15 electrical circi s including those portrayed able ember as ShaftQO.

in said aoplication. The shaft, 20, may be mounted in any suithe construction, action, and operation of able a er as in end plates or covers, 24 this improved instrument are quite similar to nd 25, the latter also supporting the core the one portrayed in said application; there- 1 These end plates may be supported 20 fore, this application will only concern itself y e ase 26. i with difierences where th y Similar The successive Coils, 14, are oppositely terminology will also be used. polarized as in any other multipolar struc- Character 3 is an armature to be tested; eits commutator. As at times the current in said coils does not 25 Section transformers are herein designated f y match and therefore would interfere as 8 and the supply circuit as 9. wlth each other, I provide shunt poles or Y 1 teeth, 17, which will serve to by pass any Supplying th j 5 53 inequality in the magnetism linked with said out from commercial ine roltages that I precoils.

39 for to intcrpose feecmg; .1 mer, 10, b By placing a choke coil, 14, or coils, so that ,80

tween the or sup 31y, 1.1, and the instruhe p l faces are symmetrically spaced and nt. all acting on a common armature their mag- By connecting adjustable shunts across the IlQtiQ p lls ba an e each other and are there- 4 indicator 12 the instrument can be made ad (illietin Operation- 35 just-able. It immaterial whether these Adjustment of this instrument for arnm shunts be non-inductive or inductive resis'ttures of different imPedan-Ces is accomplished ances. I have therefore shown a carbon comy inserting commutator: between the tact fingers, 5, then adjusting the lamp shunts or rheostats, 13, or better still the choke coil lamp shunts, 14, 15, through Window, 27, in

case, 26, until the indicating lamps, 12, are at an appropriate voltage, as about half.

pression rheostat, 13, to illustrate such a shunt.

As all forms of resistance rheostats involve contacts with all the vagaries and variations that go with contacts, I prefer to use ad ustonly one of the 0 011m ct finners 5 (Figure able lmpedances or choke coils for the said is shown The Others aware g a b 45 shunts. The windings of such an impedance arrow heads' 7 p y choke coil or coils are designated as 1 1. My inventioil may be embodied in many Prefer to adlust the impedance of said difierent ways, the embodiment illustrated coils by altering the length and the area of b i d l as a hi l f di l the air gap. To accomplish this, I form the therefore, I Wish to have my invention c l 50 coils, 14, around poles or teeth, 15, carried by strued by the appended claims;

: f-E H '1 1,902,542

Having now described my invention, I wish to claim: 1

1. In an adjustable impedance, the combination of a magnetic core having a plu 5 rality of symmetrically spacedpairs of poles, electrical windings around said poles, an armature adapted to engage the poles of said core, the engaging faces of said poles and saidarmature being tapered so that the movement of one relative to the other will effect a change in the length of the air gap. 2. In a regulating device, a magnetic core, a plurality of choke coils placed on poles of a magnetic core, an armature for closing the magnetic circuit through said poles, with shunt poles placed between said choke coils for shunting any magnetic inequality be tween said magnetic poles.

3. In a regulating device, the combination '7 Q0 of a magnetic core having poles, a plurality of choke coils placed on poles of said mag netic core, shunt poles placed between said coils, faces of said poles being tapered, with an armature for closing the magnetic circuit, the engaging face of said armature being tapered. I a. In a regulating device, the combination of a magnetic core having tapered poles, choke windings upon-said magnetic core, an 1 armature with tapered face, means for supporting said elements including a support- 7 g V p ing member attached to one element and a bearing attached to'the other to permit of positioning one element with reference to the other.

' .5. In a regulating device, the combination of a magnetic core, choke windings upon said magnetic core, an annular armature the face of said armature and the poles of said- 1 40 core being tapered, a shaft attached to oneele ment and a bearing attached to the other with means for positioning one element with reference to the other.

6. In a regulating device, the combination 4 of a magnetic core, choke windingsupon said magnetiocore, an armature tapered to engage the poles of said core, a supporting shaft attached to one element, a bearing'attached to the other, anda nut and thread so attached. 56 to said elements that the rotation of one will cause an adjustment between said armature and said core. I

In testimony whereof I hereunto affix my I 7 l signature this 18 day of Sept, 1929. PENROSE EQCHAPMAN. 

